mmc: atmel-mci: enable SD high speed support
Nicolas Ferre [Wed, 26 May 2010 21:41:59 +0000 (14:41 -0700)]
Enable high speed support for atmel-mci driver.  This support is dependent
of the revision of the IP and, of course, the capacity of the SD card
used.

Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Reviewed-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Cc: Maciej Sosnowski <maciej.sosnowski@intel.com>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/mmc/host/atmel-mci.c

index df0e8a8..f6013cc 100644 (file)
@@ -952,10 +952,21 @@ static void atmci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
                if (mci_has_rwproof())
                        host->mode_reg |= (MCI_MR_WRPROOF | MCI_MR_RDPROOF);
 
-               if (list_empty(&host->queue))
+               if (atmci_is_mci2()) {
+                       /* setup High Speed mode in relation with card capacity */
+                       if (ios->timing == MMC_TIMING_SD_HS)
+                               host->cfg_reg |= MCI_CFG_HSMODE;
+                       else
+                               host->cfg_reg &= ~MCI_CFG_HSMODE;
+               }
+
+               if (list_empty(&host->queue)) {
                        mci_writel(host, MR, host->mode_reg);
-               else
+                       if (atmci_is_mci2())
+                               mci_writel(host, CFG, host->cfg_reg);
+               } else {
                        host->need_clock_update = true;
+               }
 
                spin_unlock_bh(&host->lock);
        } else {
@@ -1052,8 +1063,11 @@ static void atmci_request_end(struct atmel_mci *host, struct mmc_request *mrq)
         * necessary if set_ios() is called when a different slot is
         * busy transfering data.
         */
-       if (host->need_clock_update)
+       if (host->need_clock_update) {
                mci_writel(host, MR, host->mode_reg);
+               if (atmci_is_mci2())
+                       mci_writel(host, CFG, host->cfg_reg);
+       }
 
        host->cur_slot->mrq = NULL;
        host->mrq = NULL;
@@ -1565,6 +1579,8 @@ static int __init atmci_init_slot(struct atmel_mci *host,
        mmc->f_min = DIV_ROUND_UP(host->bus_hz, 512);
        mmc->f_max = host->bus_hz / 2;
        mmc->ocr_avail  = MMC_VDD_32_33 | MMC_VDD_33_34;
+       if (atmci_is_mci2())
+               mmc->caps |= MMC_CAP_SD_HIGHSPEED;
        if (slot_data->bus_width >= 4)
                mmc->caps |= MMC_CAP_4_BIT_DATA;